Question

[(64x33x2:4-500x2):2+5xa]-6x12+999:9=112

Answer 1

[(64x33x2:4-500x2):2+5xa]-72+111=112
[(2112x2:4-500x2):2+5xa]-72=112-111
[(4224:4-500x2):2+5xa]-72=1
(1056-1000):2+5xa=1+72
56:2+5xa=73
28+5xa=73
5xa=73-28
5xa=45
a=45:5
a=9